I have an essay in wich I study the way a product is applied (Aplicación) and the product itself(Químico), the interaction (Tratamiento) and the block (Y)

When i do an aov in R the degrees of freedom should be:

Aplicación -> 2

Químico -> 2

Tratamiento ->4

Y->3

And that's the response:

> aovA09 anova(aovA09)

Analysis of Variance Table

Response: A09

Df Sum Sq Mean Sq F value Pr(>F)

Y 3 2.719 0.90625 0.5427 0.6566

Químico 2 1.197 0.59844 0.3584 0.7016

Aplicación 1 0.195 0.19531 0.1170 0.7346

Tratamiento 1 0.195 0.19531 0.1170 0.7346

Residuals 32 53.438 1.66992

I've read that some people doesn't set the factor but in my case that's right:

> class(LT16$Y)

[1] "factor"

> class(LT16$Tratamiento)

[1] "factor"

> class(LT16$Químico)

[1] "factor"

> class(LT16$Aplicación)

[1] "factor"

When I try to delete one factor the DF are ok:

Response: A09

Df Sum Sq Mean Sq F value Pr(>F)

Tratamiento 4 1.587 0.39687 0.2474 0.9093

Residuals 35 56.156 1.60446

Response: A09

Df Sum Sq Mean Sq F value Pr(>F)

Aplicación 2 0.759 0.37969 0.2465 0.7828

Residuals 37 56.984 1.54012

Response: A09

Df Sum Sq Mean Sq F value Pr(>F)

Químico 2 1.197 0.59844 0.3916 0.6788

Response: A09

Df Sum Sq Mean Sq F value Pr(>F)

Y 3 2.719 0.90625 0.5929 0.6237

Residuals 36 55.025 1.52847

I think that i don't put some code somewhere but i cant figure it out.

Thank you everyone.